Bolt anchor



H. W. PLEISTER ET AL BOLT ANCHOR Original Filed June 17. 1922 IllINVENTORY ;ATTORNEY Patented Oct. 2, -1923.

UNITED STATES PATENT OFFICE.

HENRY W. PLEISTER, OF WESTFIELD, AND JOHN KARITZKY, F GARWOOD, NEW JER-SEY; SAID PLEISTER'ASSIGNOR TO HENRY B. NEWHALL AND SAID KARITZKY AS-SIGNOR '10 HENRY B. NEWHALL, AS EXECUTOR OF HENRY B. NEWHALL, 83., DE-

CEASED.

BOLT ANCHOR.

Original application filed June 17, 1922, Serial No. 569,129. Dividedand this application filed June 2,

1923. Serial To all whom it may concern:

Be it known that we, HENRY W. PLEISTER, a citizen of the United States,residing at Westfield, in the county of Union and State 6 of New Jersey,and JOHN KAnrrznY, a citizen of the United States, residing at Garwood,in the county of Union and State of 'New Jersey, have made certain newand useful Improvements in Bolt Anchors, of which the following is aspecification, taken in connection with the accompanying drawings.

This application is a division of our copending application Ser. No.569,129 filed June 17 1922, required by the Patent Ofiice 1 to bedivided out of said parent application. Our invention relates to boltanchors. More particularly it relates to a ductile shield adapted tohave a portion of the shield placed under tension, and another 2 portionunder compression so that the metal of the shield will flow into thevoids and irregularities of the surface of the hole within which theshield is mounted.

Our invention further relates to a ductile shield provided with atapered and a connected cylindrical bore there being a stop or shoulderbetween the two bores.

Our invention further relates to such a bolt anchor in which-the shieldand cone, or expanding member, are formed of materials of difierentstrength, the expanding cone being of greater hardness and lessductility than the shield.

Our invention further relates to forming the shield of some ductilematerial, as aluminum, brass, fibre, lead or an alloy, so that when itis expanded the metal will flow, more or less, into the irregularitiesand voids of the wall of the hole. The expanding cone is formed of someharder material, as for example, iron, which may or may not begalvanized.

Our invention further relates to certain combinations, details ofconstruction, and articles of manufacture, which will be more fullhereinafter described and pointed out in t e claims.

In the accompanying drawings the same reference numerals refer tosimilar parts in l the several figures.

Fig. 1 is a vertical section through a wall by placing or other suitablesupport, showing one form of our bolt anchor located therein and priorto being expanded;

ig. 2 is a view similar to Fig. 1, but showing the ductile shield afterit has been expanded;

Fig. 3 is a horizontal section through the shield Fig. 1;

Fig. 4 is an end elevation of the shield shown in Fig. 1;

Fig. 5 is a cross-section on the line 5-5 of Fig. 3;

Fig. 6 is a side elevation of a modificatior1 in which'two expandingmembers are use Fig. 7 is a vertical section;

Fig. 8 is a vertical section through a wall or other suitable s pportshowing the bolt anchor of Fig. 6 in its expanded position.

Our invention broadly covers a ductile shield which is adapted to beexpanded by placing a portion of the shield under tension and anotherportion under compres sion.

Our invention also broadly covers a duotile shield having a tapered boreand a cylindrical bore, there being a stop or shoulder or other membersto ping the expanding member operating in t e tapered bore, fromcooperating with the cylindrical bore except under certain conditions.This insures that there will be first a tension of the metal and anexpansion at the end of the ductile shield in which the tapered bore islocated. This is usually at the inner end removed from the face of thewall or other suitable support 1. After a portion of the ductile shieldhas been expanded by the expanding member cooperating with the taperedbore, the ductile shield is then further expanded another portion of theductile shield under compression, which will cause the shield to beshortened. in length but in creased in diameter. This results in twoseparate and distinct expansions of the duotile metal both of which addto the hold or grip of the bolt anchor or shield within the hole 2 ofthe wall or other suitable support 1.

It is well known that in drilling a hole 2,

in a wall or other suitable support 1, of

and expanding member shown in manufactured stone or brick, cement ornatural stone, there is a certain dislodgment of pebbles or sand andhard particles constituting the mass. In our invention we insure thatthe inner end 3 of the shield 4 will fill up all these inequalities orvoids in the surface of the hole 2 that lie adjacent the end 3. Theexpansion at the inner end may be made in any suitable manner, such asby the threaded cone 5 cooperating with the screw-threads upon the boltor screw 6. This cone cooperate-s with a tapered bore 7 and with a screwor bolt 6 which passes through the cylindrical bore 8, after having beenfirst passed through the work 9. The parts are then in the positionshown 1n Fig. 1.

By rotating the head 10 of the bolt 6, in.

any suitable manner, the cone 5 is caused to cooperate with the taperedbore 7 by being drawn to the right of Fig. 1 or towards the work 9. Thiswill then cause the cone 5 to place the metal at the end 3 under tensionand expand the shield 4 at that end. The expansion of the end 3continues until the end 11 of the cone 5 contacts with the stop orshoulder 12, Fig. 3. As soon as the cone 5 reaches the stop or shoulder12 further rotation of the bolt or screw 6 places that portion of themetal of the shield 4 between the stop or shoulder 12 and the end 13,Fig. 3, under compression, which serves to slightly shorten the lengthof the shield 4 and at the same time increases its diameter, so thatthroughout practically the entire circumference of the shield, first byexerting tension and then compression, the metal will flow radially andfill up the voids and irregularities in the walls of the 12 normallyprevents the cone 5 from working too easily into the cylindrical bore.When it is desired to get the maximum grip of the shield the shoulder 12serves to retard the cone nut 5 from working into the cylindrical bore8, but, when the maximum strain is thrown on the shield the .nut willwork into the cylindrical bore and add a wedging or expanding strain tothe expansion of the shield, due to the conical nut cooperating with thetapering bore 7, and also due to compressing the shield longitudinally.

By forcing the metal of the ductile shield to flow into the inequalitiesor irregularities or voids we obtain a particularly strong union or holdwith the wall or other suitable support, our bolt anchor making a muchstronger union or hold than bolt anchors of the same size now on themarket. In Fig. 2 the expansion or flowing of the metal of the shieldinto the inequallties or voids of the wall 2 has been purposelyexaggerated to more clearly illustrate the invention.

The particlular contour and shape of the ductile shield may vary. In thedrawing, showing one form of our invention, the duehole 2. The shoulderLecaees tile shield 4 is provided with a plurality of integral membersor tines 15, 16 connected together by integral members 17, 17 of lessthickness than the tines 15 and 16 forming grooves 18, 18.

When the hole 2 is correctly that the ductile shield 4 will just fit thehole 2, the expansion shield may be expanded by simply stretching thewebs 17, 17 to expand the integral tines 15 and 16. In other cases, whenthe hole 2 is a little large, or the walls or other supports 1 are soft,and full of irregularities or voids then, the webs 17 17 will befractured or broken when the tines l5 and 16 are expanded as shown inFig. 2.

In Figs. 6, 7 and 8 we have shown a modification of our invention, inwhich the duedrilled so' tile shield 28 is formed with two taperedthence through the unthreaded cone 30, cy-

lindrical bore 29 and into the screw-threads of the cone 5. .B rotatingthe head 10 of the bolt or nut 6, the cone 5 is caused to move down itstapered bore 7, which at the same time causes the ductile shield 28 tomove up the cone 30, the work being held between the cone 30 and thehead of the nut or screw 10. The effect is to cause the cone 30 to alsomove down or cooperate with its tapered bore 7; When the end 11 of thecone 5 reaches its shoulder or stop 12, and when the end 31 of theunthreaded cone 3() reaches the shoulder or stop 12 on the right of Fig.

6, further movement along the different tapered bores 7, 7 is arrested.Further rotation of the nut or bolt 6 will then cause the metal of theshield between the stops or shoulders 12, 12 to be com ressed, whichwill tend to shorten the lengt of the shield 28 and at the same timeincrease its diameter, permitting the ductile metal to fill up all thevoids and inequalities .within the surface of the hole 2 in the wall 1.

The shoulders or stops 12, 12 normally prevent the cones from workingtoo easily into the cylindrical bore 29. When it is desired to get themaximum grip of the shield, the shoulders 12, 12 serve to retard thecones 5 and 30 from working into the cylindrical bore 29, but when themaximum strain is thrown on the shield the cones will work into thecylindrical bore and add a wedgin or expanding strain to the expansion 0the shield, due to the conical nuts coo erating with the cylindricalbore 29, an also duiel to compressing the shield longitudina y.

In this particular form of shield 28, we

have shown it provided with a groove 32 and a breakable web 33. the sameas shown in Figs. 1 and 2 of the drawings.

The expanding member or cone 5, or cones 5 and 30. can be securely heldwithin the ductile shield by friction, by simply giving it, or them, aslight tap or blow, which insures that the cone or cones or expandingmembers will not become disconnected from vibration in transportationor. through rough handling thereby obviating the necessity of thepurchaser or jobber going over the shipment to see whether or not allthe bolt anchors are properly assembled and held together and toreassemble such as have come separated during transit. \Vhile wepreferably use our invention with such shields. it is. of course. to beunderstood that other forms of shields may be used and that ourinvention is not to be limited to those illustrated and described.

Having thus described this invention in connection with an illustrativeembodiment thereof, to the details of which we do not desire to belimited, what is claimed as new and what is desired to secure by LettersPatent is set forth in the appended claims.

\Vhat we claim is 1. A bolt anchor comprising a ductile shield having aplurality of expansible parts having integral weakened connection andprovided with a tapered and cylindrical bore having a stop between thetwo bores and an expanding member adapted to cooperate with the taperedbore and with said stop.

2. A bolt anchor comprising a ductile shield having a plurality ofexpansible parts having integral weakened connection and provided with aplurality of tapered bores. and a plurality of expanding members. acylindrical bore. and a plurality of stops between the conical bore orbores and the cylindrical bore.

3. A bolt anchor comprising a ductile shield having a plurality ofexpansible parts connected together by an integral breakable web andprovided with a tapered and cylindrical bore having a stop between thetwobores. and an expanding member adapted to cooperate with the taperedbore and with said stop.

4;. A bolt anchor comprising a ductile shield having a plurality ofintegral expansible parts connected together having an integralbreakableweb. and provided with a plurality of tapered bores and acylindrical bore, with a plurality of shoulders between the taperedbores and the cylindrical bore, and a plurality of expanding membersnormally located in the tapered bores.

5. A bolt anchor comprising a ductile shield having a plurality ofexpansible parts having integral weakened connection and provided with atapered and cylindrical bore having a stop between the bores to normallyprevent the expanding nut from working too easily into the cylindricalbore, and an expandin nut.

6. A bolt ancihor comprising a ductile shield having a plurality ofintegral expansible members connected together by an integral breakableweb and provided with a tapered and cylindrical bore having a stopbetween the bores to normally prevent the expanding nut from working tooeasily into the cylindrical bore. and an expanding nut.

7. A new article of manufacture comprising a ductile shield having aplurality of integral parts connected together by breakable means andprovided with a tapered bore and a cylindrical bore there being ashoulder between the two bores.

HEKRY \V. PLEISTER. JOHN KARITZKY. \Vitnesses as to Pleister: MARY R.REGAN, H. M. \Vrrnmns,

'itnesses as to Karitzky:

F. W. KAmTzKY, 7M. NEILL.

